An 80-Kg Fireman Slides Down a 3-Meter Pole by Applying

An 80-kg fireman slides down a 3-meter pole by applying a frictional force against the pole using his hands.If he slides from rest and he land on the ground with a speed of 6.00 m/s,the frictional force his hands applied against the pole was

A) 423 N.
B) 581 N.
C) 735 N.
D) 305 N.
E) 912 N.